Hello,
What is your opinion regarding the bottom of new foundation for the basement walkout stair? Creating a walkout for the basement will affect the frost line. Should I start counting the required 36" from the bottom of the stairs? In addition, the existing house foundation should not be...
Hello,
I am working on a residential house with a very long (51 feet) steel ridge beam (cathedral ceiling). The gravity loads are +- 500 plf. I am looking for some opinions on how to properly connect the steel members to each other and if there are any other things to consider when such a big...
Hello everyone,
I have a packed out steel girder that is going to support an lvl beam with 10 kips point load. It will be a flush connection. What do you recommend checking in such situation ? I figured I would install 3-4 bolts on each side and calculate for shear between steel web and wood...
Hello everyone,
I am struggling with a two story residential house where the walls of the second floor almost entirely do not line up with the walls below. Even the outside walls end up on headers, second floor envelope is smaller (walls ends up in the middle of living room) or they are...
Hello,
I am designing a PEMB foundation. The base plate will sit on a pier (42"x42"x24"deep) which will rest on the actual footing (8'x8'). I am having a difficult time with the side shear breakout in the pier. For the front shear breakout I will provide hairpins wrapped around anchor bolts...
Hi everyone,
I am to design a new 4-story building. It is going to be a row house in NYC and it will be adjacent to the existing row house. It seems the previous building has been demolished together with foundation and the hole filled.
1. The new house wall will be on the property line each...
Hi everyone,
I am designing a PEMB foundation that is going to be near existing building. The new foundation by the existing building will be placed not directly under the columns but offset a couple feet. Because the new PEMB is small the footings will overlap, so one continuous foundation...
Hi everyone,
I am currently working on residential concrete cantilevered stairs and landing. The architect wants to keep 4" stair thickness, but my calcs show about 1/2" deflection. By changing to 5" thickness I could bring the deflection down to 0.2". I usually do not design concrete...
Hello everyone,
I am currently designing a platform to support a hopper tank (tank design by others). It will be a steel frame platform with 2+3 legs (see attached). Of course a truck needs to drive through so I am having an issue with bracing in one direction.
1. What loads would you consider...
Hello,
Can someone write a formula for the net average moment of inertia (Iavg) of the CMU wall ? I have been trying to come up with a formula for Iavg but it is always way off the NCMA charts.
For example:
12" wall (11.625")
face shell = 1.25"
webs = 1.125"
spacing = 24"
Iavg = 1165.4 in2/ft...
Hi everyone,
I'm about to design a metal deck over existing building. It will be a deck with 4" concrete over metal deck over steel joists. The joist will rest on beams and columns. The whole structure will not be attached to the existing building. Live load 100 psf. See attached sketch.
I...
Hello everyone.
Recently, I was hired by a company to perform a structural analysis and do structural drawings for a project. I will invoice them for my services (I'm not that company employee).
My question is, am I responsible in any way for this design if:
1) My name is not on the drawings...
Hello everyone,
I'm designing a repair for a pool deck. A 4x4 wood posts is embedded in a 5.5" concrete slab, approximately 4" away from the edge. Needless to say, the slab cracks at 45deg from the corners of the post towards the slab edge.
The owners would like to keep the wood posts instead...
Hello,
Like in the subject - what are the limit states of the connection with only bottom flange of the beam coped? It is a beam-girder connection. I'm trying to find an example but no luck so far.
Thanks,
Hello,
Does anybody know the differences between the newest version (3rd ed., 2009) of Detailing for Steel Construction and the older versions? The book price difference is significant.
Thanks.
Hello everyone,
I'm looking for some guidance/advice as I'm just at the beginning of my PE carrier path. I recently obtained the PE license and I want to start working on my own (partially). I also work for an engineering company where I do not seal anything (my boss is a PE).
1. Is it even...
Hello everyone,
I have a steel beam (W16X31) running parallelly to floor WOOD trusses (18" deep). The beam is located in the floor (bottom flush), above a garage. On top of the steel beam there will be a nailer and all will be "bounded" with floor sheathing.
The beam spans 29' and there are two...
Hello,
I have two questions:
1. When using AISC tables for welded shear connections, what is the load eccentricity assumed? I'm trying to solve a few examples in order to understand the welded connection design procedures.
2. Do you know where I can find some step-by-step weld connection...
Hello everyone,
I have three questions regarding wood detailing/design:
1. (See pic. "1") In the situation presented in picture "1", is it okay to assume that both beams (separated by a pile) carry the same amount of load from the joists ? To me it seems like the interior part/ply of the beam...
Hello everyone,
I'm trying to compare my hand calculations for punching shear (with Moment and Force) with computer program and the result is a little off. I would like to make sure I use the right values. See below:
The maximum shear stress for both moment and force is given as: vu =...
